It really varies for me. I'm on as much as I can, but I work and go to school during the week and then I have family stuff on the weekends. I feel like I'm still on all the time though, lol.
Im on everyday from 10AM - 12AM (Midnight) Sometimes varies with work, so if I worked, Id go offline around 3PM, also if I'm tired I go offline around 10/11PM, but that is sadly rare nowadays
Inconsistent as well, I try to be around whenever I can. Usually on evening for me (exception is holidays when I can be online even on mornings) around few hours if I have no assignments to do.